The DacMagic Plus comes as default with Digital Preamp mode enabled. In this mode the output from the Unbalanced and Balanced audio outputs is controlled by the front panel Volume control.
If you wish to disable this mode (and have fixed line-level level output from the Unbalanaced and
Balanced Audio outputs) switch the DacMagic Plus off, then push and hold the Volume control in whilst switching the DacMagic Plus on.
The DacMagic Plus confirms the setting by flashing the source LEDs downwards for Digital Preamp mode and upwards for Fixed Line Level Mode.